Type Coercion in JavaScript

Type Coercion in JavaScript — a practical guide to JavaScript type coercion with clear examples you can reuse in real projects.

JavaScript Tutorial Series (15/101). Prefer one article? Read the complete JavaScript tutorial.

Short description

Use === and !== to avoid surprising coercion.

Coercion pitfalls

1 + '2';     // '12'
1 == '1';     // true
1 === '1';    // false
[] == false;  // true (weird)